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The sum of angles in a trapezoid-like other quadrilateral is 360°.

Two angles on the same side are supplementary, that is the sum of the angles of two adjacent sides is equal to 180°.

The length of the mid-segment is equal to 1/2 the sum of the bases.

The diagonals of trapezium bisect with each other.

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The legs are congruent by definition.

The bases are parallel by definition.

The lower base angles are congruent.

The upper base angles are congruent.

The diagonals are congruent.

Any lower base angle is supplementary to any upper base angles.

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Two disjoint pairs of consecutive sides are congruent by definition.

The diagonals are perpendicular.

One diagonal is the perpendicular bisector of the other.

One of the diagonal bisects a pair of opposites angles.

One pair of opposite angles are congruent.

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All the properties of a parallelogram apply by definition.

Two Consecutive sides are congruent by definition.

All the sides are congruent.

The diagonals bisect the angles.

The diagonals are perpendicular bisectors of each other.

The diagonals divide the rhombus into four congruent right triangles.

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All the properties of a rectangle apply by definition.

All properties of a rhombus apply by definition.

The diagonals form four isosceles right triangles.

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All the properties of a parallelogram apply by definition.

The angles are right angles.

The diagonals are congruent

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There are many types of quadrilateral. Some of them are given below.